Flux for welding nickel and nickel alloy.



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RICHARD SAMESREUTHER, OF DUSSELDORF, GERMANY, ASSIGNOR 0F ONE-HALF TOTHE FIRM OF AUTOG-ENWERK SIRIUS, GESELLSCHAFT MIT BESCHRANKTER HAF-TUNG, OF DUSSELDORF-ELLEB, GERMANY.

FLUX FOR WELDING NICKEL AND NICKEL ALLOY.

Be it known that I, RIoHAnD SAMES- REUTHER, a subject of the GermanEmperor,

and resident of Dusseldorf, Rhineland, Ger- 1 many, have invented a newand useful Flux for Welding Nickel and Nickel Alloys, of which thefollowing is a specification.

In autogenous welding of nickel and nickel-alloys by using anoxygen-weldingpipe, it has been found that the heated metal absorbscertain quantities of oxygen or other gases, which are freed at themomentof cooling, thus making the welded piece brittle and porous.

My invention consists in a flux for weld ing nickel and nickel-alloyswhich avoids the above stated objections. According to my invention Iuse in con- ]unction with metal chlorids and chromium a flux offire-proof materials which have the property of avoiding the influenceof the atmosphere upon the melted metal. This flux contains alkalis asits essential substance which may be mixed with metal-chlorids. The fluxmay be in the form of a paste or of a powder.

The alkali, say waterglass, covers the Welding piece with a fire-prooffilm thus avoiding the influence of the atmosphereupon the heated metal,whereas the metalchlorids, such as chlorids of magnesium or molybdenum,decompose the metal combining with the nickel and the chlorids,dissolving the oxids of nickel. An addition of chlorid of calcium may beused in order to dissolve any possible slags.

The filling-wire consists of nickel with an addition of chromium orchromium-compounds. This addition has the purpose of Specification ofLetters Patent.

Patented May 1, 119 171 Application filed December 29, 1914. 'Serial No.879,445.

dissolving the fire-proof film formed by the alkali at the very point ofthe welding seam. Other metals, principally copper and molybdenum, mayalso be added to the fillingwire according to the kind of metals to beacted upon, in order to obtain a weldingseam that may be equal to thebody of the work piece.

The essence of my inventlon 1s that in order to effect a proper weldingof nickel or nickel alloys, there must be present (in addi- "tion tometal of the same character as the oneto be welded), three substances oringredients, viz. first, alkali, second metal chlorid, and third,chromium. The purpose of the alkali is, stated above, to form afireproof film during welding. This film, however, would prevent theparts to be welded,

from fusing together, and to avoid this detrim'ental action, metalchlorid and chromium are used during the welding process.

I claim:

1. Flux for autogenous welding of nickel consisting of a mixture ofalkali, metal chlorid and chromium to be applied on the edges of theweld and on the filling wire.

2. Flux for autogenous welding of nickel consisting of a mixture ofalkali, metal chlorid and chromium, whereof part of the substances iscombined to make a paint to be applied on the edges of the weld and onthe filling wire and part of the substances is incorporated in thefilling wire.

In testimony'whereof I have hereunto set my hand in the presence of twowitnesses.

RICHARD SAMESREUTHER.

Signed in presence of- KURT DEGEN,

